T187345 Ball Fits John Deere 850J, 850KOne New Aftermarket Replacement Blade Pivot Ball for John Deere 850 Series Crawler Dozers This aftermarket replacement blade pivot ball (T187345) is a heavy duty spherical component located at the dozer blade pivot point, mounted between the blade arms and the C frame or blade socket assembly. It provides the spherical surface necessary for smooth tilt and angle articulation of the dozer blade under load, and should be replaced when worn to restore